Combination attachment for tools.



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GOMBHMTON ATTACHMENT EGR TOOLS, ASPHCLLTIOF FILED APE 2a, 1909 E im w Tg s,

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yijlif me da* ri't i TVH* 41 i E l' E. l ed sJ t t el i i A nlnldl UA DAVE E. SHAW', @E lVlLWE/'AUEEE-A, YWSSGYSEN.

CGMBNATCN ATTACEMENT FOR 'EG-GLS.

953,863 Specification f Letters Eater-t- ?ateirted Apr. 5, i. Application filed April 23, 1909. Serial Ho. 91.81,?

To all who/m it may concern:

Be it known that I, DAVID E. SHAW, residing in Milwaukee, in the county of Milwaulree and State of l/Visconsin, have invented new and useful improvements in Combination Attachments for Tools, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

rlhis invention has for its object to provide an attachi'nent for a straight edge or any tool having straight edge, such as the common hand saw, which attachment may be swung upon the tool to a desired angle with relation to the straight edge so as to enable the straight edge to be used as a try-square or an adjustable miter square, and being provided with an index linger and a uated scale to show the degrees of the angle formed by the attachment with relation to the straight edge so as to constitute a protractor for producing the angle which it is desired to use.

another object of the invention is to provide such an adjustable attachment with a spiritlevel by means of which the straight edge of the tool may be employed as level, when the attachment is parallel therewith, or may be employed as a plumb, when the attachment is adjusted to its angle of ninety degrees with relation to the straight edge, or may serve as a means for measuring the degree of inclination of a surface.

Another object of the invention is to pro* vide such an attachment with means for rigidly loclring it in its adjustments and for readily finding the adjust-ment for the angles most frequently used.

Another object of the invention is to provide such an attachment with duplicate members for opposite sides of the straight edge which may be locked together to nieve in unison, or which may be disconnected from each other to move independently so that one may form a dii'erent angle from the other.

Another object of the invention is to provide such locking means for the adjustable members in the form of a sliding caliper gage on one member adapted to engage the other member.

`With the above and other objects in view the invention consists in the combination attachment for tools herein claimed, its parts and combinations of parts and all equivalents.

Referring to the accompanying drawings in which like characters of reference indicate the same parts in the diti'erent views; Figure l is a side eleY-,fation of a combination attachment for tools constructed in accordance with the present invention and applied to a hand saw; is a plan view thereof inverted and removed from the saw; Fig. is an enlarged sectional view on the plane of line i3-JB l; L is an, end view of the attachment in position on the saw, itig. is a transverse sectional view thereof; and, F 6 is nlan view of the end of blades of the attachment showing the construction of the caliper gage for loci*- ing them together.

in these drawings the invention is shown comprising a pair of members for attachment to t ie opposite sides saw blade 9 or other straight edge, each member being provided with a sector-shaped plate l() at its intermediate part with a spirit level ll at one end and ilat blade l2 at the other end. rEhe blade l2 extends across the plate l0 and is an extension of a plane surface of the portion containing the spirit level so that the member has a plane surface extending from one end to the other and at right angles to the plane of the inner face of the sector plate so as to stand at right angles to the plane of the saw blade or other plate to which it is attached. fr. bolt 13 passes through the two sector-shaped plates l0 at the center point thereof and also through an opening provided therefor in the saw blade, and upon this bolt the two members are pivotally mounted to swing together' or independently. clamping bolt le also passes through the saw blade and projects through slots lo in the plates l() which are curved about the bolt i3 as center. fr nut 16 is threaded on the clamping bolt le on each side of the saw blade to clamp it firmly in place thereon and the slots l5 are widened at the inner face of the members to aecommodate the nuts 16 throughout the range of adjustment of said members. @n its projecting ends the clamping bolt lt is provided with winged nuts l'? which may be tigl'itened upon spring wire index lingers 18 having bent ends let into openings 19 in the ends of bolt 13 and projecting through opeuings near the ends of bolt lli with their other ends bent slightly inwardly to lit in series of grooves or notches 20 along the outer arc-shaped raised edges of plates l0. ,When

the winged nuts 1T are loose the members 10 may be swung on the bolt 13, the ends of index tinge 18 springing into the successive notches Q0 as they pass, and when the desired angle tor the blades 12 with relation to the straight edge is reached, as indicated by the index finger 1S on the scale of graduations appearing` alongside of the notches, the winged nuts are tightened and thereby iirmly lock the attachment in its adjustment. it is obvious that the ind x ringer 1S by being held tightly in the notches 20 by the winged nut wll serre the purpose oi locking the attachment in its adjustments, but by tightening' the winged nutl 17 further the index finger may be forced against the swinging mei ber so that 1 the clamping action is direct from the bolt lil, with the index iinger interposed as a washer between the winged nut and the swinging .i oer, and thereby avoid the possibility ot the adjustment being' disturbed by the yielding ot the index finger should the attachment receive a blow.

In order to detachably lock the two swinging members together one ot them is made slightly shorter than the other and this dit terence is made up by the head Q1 of a caliper gage whose graduated stem 9.2 is dove-tailed in the tace ot said member, there being a "i"- shaped arm 23 extending laterally from the head Q1 and fitting in a correspondingly shaped slot and recess in the end ot' the other member, as shown in Figs. et, 5 and 6. vWhen the caliper gage is closed so that the arm thereof nts in the seat prorided tor it t-he two blades 12 are locked together so that they stand at the same angle with relation to the straight edge and move in unison during their adjustment. rjhe caliper gage may be drawn outwardly so as to disconnect the blades 12, and then the two members may be adjusted independently so that they may stand at ditierent angles with relation to the straight et ge.

ln use, it is only iecessary to adjust the attachment to the angle oit ninety degrees when the tool may be used as a try-square to accurately indicate a right angle by i Aeans of the straight edge when either of the swinging members bears flat against the edge ot the work. lr" other angles are desired the attachment may be adjusted accordingly so that the device may serve the purpose of a miter square, and furthermore by means ot the graduated scale and index finger the degree ot the angle is indicated so that the tool constitutes a irotractor. qq,Yhen

the attachment is in its normal or zero posi tion, as shown in 1, the straight edge may be used as a level, the spirit level 11 on either side thereof indicating when said straight edge is in a horizontal position, or when the degree ot inclination ot' a slantiiig surface is desired to be measured the straight edge is placed thereon and the attachment swung to the position where its spirit level indicates that the blades 12 are horizontal, then the index finger 18 will indicate on the Craduated scale the degree ot inclination. Ehe spring index finger engaging the notches 2() and snapping from one to another as the blade is swung serves to assist in the adjustment to the degrees of angularity which are most commonly used andl permit of such adjustments being quickly mace.

lhen the attachment is mounted on a saw and is not in use it stands in a posit-ion with relation to the saw blade where it will not interfere with the usual work of the saw and where it will not be liable to injury.

lt is obvious that the invention is not confined in its use to its application to a saw blade, but that it is adapted to be applied to any tool having a straight edge, such as a square or a drattsmans triangle or the like, and the terni straight edge is therefore employed to designate any tool suitable tor the purpose.

lfhat claim as my invention is- 1. in attachment tor straight edge tools, comprising a member having pivotal connection with the tool and provided with an are shaped slot, clamping screw mounted on the tool and passing through the are-shaped slot ot' the memba'. there being a series of notches in the. member radial to the pivotal connection, and a linger mounted on the pivotal connection ot the member and held by the clamping screw in engagement with the notches.

Q. An attachment tor straight edge tools, comprisingl a member having a pivotal connection with the too-l and provided with an are shaped slot, a clamping screw mounted on the tool and `1ra-.seing through the arcshaped slot ot the member, there being a series ot notches in the member radial to the pivotal connection, a spring finger mounted on the pivotal connection of the member guided by the screw, and a nut threaded on the clamping screw and engaging the index linger tor holding it in engageinentwith the notches.

in attachment :tor straight edge tools, comprising a member having a pivotal connection with the tool and provided with an arc-shaped slot, a clamping screw mounted on the tool and passing through the arcshaped slot ot the member, there being a series ot graduated notches in the member, and an opening in the clamping screw, a spring index linger mounted on the pivotal connection and passing through the opening in the clamping screw, a nut threaded on the clamping sere tor holding the index linger in the notches, and a spirit level carried by the pivotal member.

i. in attachment tor stra-ight edge tools,

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comprising a pair of members having the independent pivotal connections with the tool and provided with arc shaped slots, a clamping screw mounted on the tool and passing through the arc-shaped slot in each ot the members for clamping them in their independent ustments, and means for detachablv locking the members together.

An attachment for straight edge tools, comprising a pair of members having independent pivotal connections with the tool provided with arc-shaped slots, a clamping screw mounted on the tool and passing through the arc-shaped slot in each of the members for clamping. them in their independent adjustments, means for detachablv locking the members together, and a spirit level carried b v each of the members.

6. An attachment for straight edge tools, comprising al pair or members having pivotal connection with the tool and provided with arc-shaped slots, a clamping screw mounted on the tool and passing through an arc-shaped slot in each ot the members for clamping them in their adjustments, there being a series of notches on each member radial to the pivotal connection, and a spring finger t'or each member mounted on the pivotal. connection thereof and guided by the clampii'ig bolt and adapted to enga-ge the notches ttor locking the members in their adjustments.

7. An attachment :for straight edge tools comprising a pair of swinging members, a pivotal bolt passing through the tool on which the members are pivotally mounted, and having openings in its ends, a clamping bolt passing through the tool and having nuts threaded thereon engaging opposite sides of tool, there being arc-shaped slots in the swinging members through which the ends et the clamping bolt project, each of the swinging members having a series of graduated notches, and each end of the clamping bolt having an opening, a spring Wire index finger for each of the members having its end entered in an opening in the end ot the pivot bolt and passing through the opening in the end of the clamping bolt and engaging the notches, and Winged nuts threaded on the ends of the clamping bolt for clamping the members in their adjustments.

8. An attachment for straight edge tools, comprising a pair of swinging members hav ing pivotal connection with the tool and provided with arc-shaped slots, a clamping bolt mounted on the tool and projecting' through arc-shaped slots of the swinging members and adapted to clamp them in their adjustments, and means for locking the swinging members together comprising a caliper sliding in one member and having a -shaped arm engaging a slot iu the other men'iber.

9. An attachment for straight edge tools, comprising a pair o1 members having independent pivotal connections with the tool on opposite sides thereof and provided with arc-shaped slots7 a clamping screw passing through the tool, nuts threaded on the clamping screnvv and engaging the opposite sides of the tool, the ends of the clamping seresT passing' through the arc-shaped slots in each of the members, and nuts threaded on the ends o the clamping screw t'or clamping the iembers in their independent adjustments,

In testimony Whereohl attixmy signature, iu presence of two witnesses.

DAVID E. SHAW'.

`Witnesses E. S. C. CALDWELL, ALMA A. KLUG. 

